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authorRich Felker <dalias@aerifal.cx>2014-06-04 02:24:38 -0400
committerRich Felker <dalias@aerifal.cx>2014-06-04 02:24:38 -0400
commitbdad2fefb206d9727d4a3254f7883b8455452d89 (patch)
treef700c40bc61308cf7ac1a66d63f5bb16e1aca6eb /src/network/lookup_name.c
parent8041af59881219c32267c3491bee43591d3c3fe6 (diff)
downloadmusl-bdad2fefb206d9727d4a3254f7883b8455452d89.tar.gz
add support for ipv6 scope_id to getaddrinfo and getnameinfo
for all address types, a scope_id specified as a decimal value is accepted. for addresses with link-local scope, a string containing the interface name is also accepted. some changes are made to error handling to avoid unwanted fallbacks in the case where the scope_id is invalid: if an earlier name lookup backend fails with an error rather than simply "0 results", this failure now suppresses any later attempts with other backends. in getnameinfo, a light "itoa" type function is added for generating decimal scope_id results, and decimal port strings for services are also generated using this function now so as not to pull in the dependency on snprintf. in netdb.h, a definition for the NI_NUMERICSCOPE flag is added. this is required by POSIX (it was previously missing) and needed to allow callers to suppress interface-name lookups.
Diffstat (limited to 'src/network/lookup_name.c')
-rw-r--r--src/network/lookup_name.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index 02920930..492e932c 100644
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -1,6 +1,7 @@
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
+#include <net/if.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <stdlib.h>
@@ -47,9 +48,31 @@ static int name_from_numeric(struct address buf[static 1], const char *name, int
buf[0].family = AF_INET;
return 1;
}
- if (family != AF_INET && inet_pton(AF_INET6, name, &a6)>0) {
+ if (family != AF_INET) {
+ char tmp[64];
+ char *p = strchr(name, '%'), *z;
+ unsigned long long scopeid;
+ if (p && p-name < 64) {
+ memcpy(tmp, name, p-name);
+ tmp[p-name] = 0;
+ name = tmp;
+ }
+ if (inet_pton(AF_INET6, name, &a6)<=0) return 0;
memcpy(&buf[0].addr, &a6, sizeof a6);
buf[0].family = AF_INET6;
+ if (p) {
+ if (isdigit(*++p)) scopeid = strtoull(p, &z, 10);
+ else z = p-1;
+ if (*z) {
+ if (!IN6_IS_ADDR_LINKLOCAL(&a6) &&
+ !IN6_IS_ADDR_MC_LINKLOCAL(&a6))
+ return EAI_NONAME;
+ scopeid = if_nametoindex(p);
+ if (!scopeid) return EAI_NONAME;
+ }
+ if (scopeid > UINT_MAX) return EAI_NONAME;
+ buf[0].scopeid = scopeid;
+ }
return 1;
}
return 0;
@@ -179,10 +202,10 @@ int __lookup_name(struct address buf[static MAXADDRS], char canon[static 256], c
/* Try each backend until there's at least one result. */
cnt = name_from_null(buf, name, family, flags);
- if (cnt<=0) cnt = name_from_numeric(buf, name, family);
- if (cnt<=0 && !(flags & AI_NUMERICHOST)) {
+ if (!cnt) cnt = name_from_numeric(buf, name, family);
+ if (!cnt && !(flags & AI_NUMERICHOST)) {
cnt = name_from_hosts(buf, canon, name, family);
- if (cnt<=0) cnt = name_from_dns(buf, canon, name, family);
+ if (!cnt) cnt = name_from_dns(buf, canon, name, family);
}
if (cnt<=0) return cnt ? cnt : EAI_NONAME;